实际上,我想要的是,当我上传1张图片时,原始图片将存储在upload / og /中.但我也想要不同尺寸的图像,如1366×768,1280 * 600,768×1024等…不仅仅是这些尺寸,它将与图像成比例.

我有一个代码,它将该图像转换为拇指与比率,这适用于max-width = 300和max-height = 600.

define ("MAX_SIZE","100");
define ("WIDTH","300");
define ("HEIGHT","600");
function make_thumb($img_name,$filename,$new_w,$new_h)
{
    $ext=getExtension($img_name);
    if(!strcmp("jpg",$ext) || !strcmp("jpeg",$ext))
        $src_img=imagecreatefromjpeg($img_name);
    if(!strcmp("png",$ext))
        $src_img=imagecreatefrompng($img_name);

    //gets the dimmensions of the image
    $old_x=imageSX($src_img);
    $old_y=imageSY($src_img);

    // next we will calculate the new dimmensions for the thumbnail image
    $ratio1=$old_x/$new_w;
    $ratio2=$old_y/$new_h;
    if($ratio1>$ratio2) {
        $thumb_w=$new_w;
        $thumb_h=$old_y/$ratio1;
    }
    else {
        $thumb_h=$new_h;
        $thumb_w=$old_x/$ratio2;
    }
    $dst_img=ImageCreateTrueColor($thumb_w,$thumb_h);
    imagecopyresampled($dst_img,$src_img,$thumb_w,$thumb_h,$old_x,$old_y); // resize the big image to the new created one

    if(!strcmp("png",$ext)) // output the created image to the file. Now we will have the thumbnail into the file named by $filename
        imagepng($dst_img,$filename);
    else
        imagejpeg($dst_img,$filename);

    imagedestroy($dst_img);
    imagedestroy($src_img);
}
function getExtension($str) {
    $i = strrpos($str,".");
    if (!$i) { return ""; }
    $l = strlen($str) - $i;
    $ext = substr($str,$i+1,$l);
    return $ext;
}

$errors=0;
if(isset($_POST['submit']))
    {
    //reads the name of the file the user submitted for uploading
    $image=$_FILES['scrnsots']['name'];
    if ($image)
    {
        $filename = stripslashes($_FILES['scrnsots']['name']);
        // get the extension of the file in a lower case format
        $extension = getExtension($filename);
        $extension = strtolower($extension);
        // if it is not a known extension,we will suppose it is an error,print an error message
        //and will not upload the file,otherwise we continue
        if (($extension != "jpg") && ($extension != "jpeg") && ($extension != "png"))
        {
            echo '